code: def to_dict(self) -> Dict[str, Any]:
      return {
          "feature_type": self.feature_type,
          "dtype": self.dtype,
          "shape": self.shape,
      }
  
imports: from collections import namedtuple
  from io import BytesIO
  import numpy
  from itertools import chain, islice
  from enum import Enum
  import json
  from bigdl.dllib.utils.log4Error import *
  from typing import Any, Dict, Iterator, List, Union, TYPE_CHECKING
label_desc: Use image node_id 1 for calling the SchemaField obj's underlying member method code with example usage: obj.to_dict() and returns: dict